Electrode for electric-arc lamps.



F. BUCHANAN.

ELECTRODEFOR ELECTRIGARC LAMPS.

APPLICATION FILED MAY 22. 191|.

Patented Jan. 15, 1918.

/g/M EMDR @L ATTORNEU WITNESSES: l

UNITED STATES PATENT OFFICE.

FRANK BUCHANAN, "F SYRACUSE, NEW YORK.

ELECTRODE FOB.,ELECTRIC-ARC LAMPS.

Speeication of Letters Patent.

,Patented Jan. 15, 1918.

riginal application led October 2o, 1909, Serial No. 523,579. Dividedand thisvapplication led May 22,

To all whom z't may concern.'

Bc it known that I, FRANK BUCHANAN of Syracuse, in the county ofOnondaga and State of NewYork, have inventeda certain new and usefulElectrode for Electric-Arc Lamps, of which the following is aspecification.

My invention has for its object the production of an electrodeparticularly applicable for use in flaming arc electric lamps, designedto be used in places where there is vibration tending to jar theelectrodes loose, such as head lights of the class described in myapplication Serial No. 523,579 liled Oct. 20, 1909 of which thisapplication is a 'division; and the invention consists in thecombinations and constructions hereinafter set forth and claimed.

In describing this invention reference is had to the accompanyingdrawings in which.

like characters designate corresponding parts in all the views.

-Figure 1 is a vertical sectional view of a head light embodying myinvention.

Fig.- 2 is a detail view of the upper nonconsuming electrode.

Fig. 3 is a fragmentary view showing the means for holding the upperelectrode.

Fig. 4 is a modified form of parts shown in Fig. 2.

l is the casing of the head light embodying m invention, the casinghaving a renovabie door 2 at its front end, carrying a ens 3.

4 is a frame located within the casing and removable as a whole throughthe door opening, said frame supporting upright electrodes 5 and 6 andthe mechanism for controlling the operation of such electrodes. Theframe also supports a suitable reflector 7 and an incandescent lamp 8.The construction of the casing and t e frame supporting the lampmechanism forms no part of this invention and for a full description ofmy invention is non-consuming or consumes ve slowly and comprises twometal rods 9 an 10 arranged end to end and composed of different metals,or metals of different character, the lower rod 10, the lower end ofwhich is opposed to the upper end of the lower electrode 6, being of acomparatively soft metal, which is -a better con- Serial No. 628,633.

la lapping joint and a fastening member extending transversely throughsaid joint, and usuallyfone rod, as the upper steel rod 9, is formedwith an axial socket which receives the reduced upper end l1 of thelower copper rod 10, and a pin 12 is passed transversely through thelower end of the steel rod 9, the socket and the reduced upper end 12 ofthe copper rod 10. l

However, as seen in Fig. 4, the reduced end 13 of the copper rod may bethreaded and screwed into athreaded axial socket 14 of the upper rod.

The electrode is held or supported by means clamping the harder or steelrod 9 and as here shown such means is located in a chimney orVentilating tube 15 servingv to convey from the arc, the gases formed atthe al c, nd such clamping mears consists of an eye 16 formed integralwith the wall of the chimney or Ventilating Hue 15 and encircling thesteel rod 9, and a. setscrew 17 extending transversely through` thewalls of the eye and the tube and having its head 18 exposed on theexterior of the tube, the inner end of such screw engaging the steel rod9.

Owing to the fact that the upper electrode 5 is formed of sections oftwo metals of different degrees of hardness, and expansion andcontraction, the section of soft metal can be used as the electrodeproper to coact with the other electrode to form thev arc, while thesection of harder metal in which the expansion and contraction iscomparatively small and substantially the same as the expansion andcontraction of the eye 16 and the set screw 17 when subjected to theheat from the arc and atmospheric temperatures can be used to coact withthe electrode holding. or supporting means inz order that the electrodewill be at all times tightly held.l

cling and vdetachablv holding an electrode, and a metallic electrodecomprising two sections arranged end to end and having their contiguousends detachably secured together, one section being engaged and held bylsaid ring and composedof a metal having substantially the sameexpansion and contrae# tion as said ring when subjected to the heat fromthe arc and to atmospheric temperatures, and the other section havinggreater expansion and contraction under said heat and temperatures, thelatter section being softer thanthe section engaged by the holdingmeans, and the metal of the softer seetion being slower consuming thanthe elec- 15 tric arc, substantially as and for the purpose set forth.

In testimony whereof, I have hereunto signed my name in the presence or"two attesting witnesses, at Syracuse, in the county 20 of Onondaga, inthe State of New York, this 8th day of May, 1911.

. FRANK BUCHANAN.

Witnesses:

WM. CORNELL BLANDING, C. C. SCHOENECK.

